update README.md and CHANGELOG.md with Ariel OS support

Author: kaspar030

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Added
+
+- Support [Ariel OS](https://ariel-os.org).
+
 ## [0.6.0]
 
 ### Added

README.md

@@ -147,6 +147,7 @@ mod tests {
 | `embassy`            | No       | Enables async test and init functions. Note: You need to enable at least one executor feature on the embassy-executor crate unless you are using the `external-executor` feature.             |
 | `external-executor`  | No       | Allows you to bring your own embassy executor which you need to pass to the `#[tests]` macro (e.g. `#[embedded_test::tests(executor = esp_hal::embassy::executor::thread::Executor::new())]`) |
 | `xtensa-semihosting` | No       | Enables semihosting for xtensa targets.                                                                                                                                                       |
+| `ariel-os`           | No       | Enables [Ariel OS](https://ariel-os.github.io/ariel-os/dev/docs/book/testing.html) integration.                                                                                               |
 
 Please also note the doc for
 the [Attribute Macro embedded_test::tests](https://docs.rs/embedded-test/latest/embedded-test/attr.tests.html).